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Wolfram Research
Wolfram Math World: Vector Space Projection
This webpage discusses projections in vector space. The material is rather advanced. A clear understanding of Linear Algebra, the study of linear equations and their transformations, is required to understand this information.
Math Medics
S.o.s. Math: Method of Partial Fractions
This lesson teaches how to dissect complicated fractions into the sum of simple fractions.
Khan Academy
Khan Academy: Fitting Quadratic and Exponential Functions to Scatter Plots
Determine if a quadratic or exponential model fits a data set better, then use the model to make a prediction. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.